Tasmania experienced very high renewable penetration at 98.2% during the evening of 8 July 2026, driven predominantly by hydro generation (3,609 MW combined) with modest wind and gas contributions. Regional electricity prices rose sharply from $100.56/MWh to a peak of $126.28/MWh over the 30-minute window, before moderating to $107.19/MWh.
The price trajectory appears driven by binding constraints F_T+RREG_0050 and F_TASCAP_RREG_0220, which collectively carried marginal values ranging from $3.85 to $18.94/MWh during this period. The sharp price escalation between 20:20 and 20:30 UTC and the subsequent moderation suggest these constraints tightened and then eased, likely reflecting transmission or regional regulation requirements that limited the system's ability to further utilise the abundant renewable supply despite its 98% share of generation.
Causal analysis generated by gridIQ's synthesis model from live AEMO market data: dispatch prices, generation mix, interconnector flows and market notices in the interval surrounding the event.